// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
// then press Enter. You can now see whitespace characters in your code.
public class Main {
    public static void main(String[] args) {
        SIMOfChinaTelecom simOfChinaTelecom = new SIMOfChinaTelecom();
       // simOfChinaTelecom.giveCorpName();
       // simOfChinaTelecom.giveNumber();

        SIMOfChinaMobile simOfChinaMobile = new SIMOfChinaMobile();
       // simOfChinaMobile.giveCorpName();
       // simOfChinaMobile.giveNumber();

        MobileTelephone mobileTelephone = new MobileTelephone();
        mobileTelephone.useSIM(simOfChinaMobile);
        mobileTelephone.printInfo();

        mobileTelephone.useSIM(simOfChinaTelecom);
        mobileTelephone.printInfo();
    }
}